Oxygen tank case



FIG. 1 is a top and front perspective view of an oxygen tank caseshowing my new design;

FIG. 2 is a top and front perspective view thereof with the opening inclosed condition;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view of FIG. 2.

The ornamental design for an oxygen tank case, as shown and described.